The new Audi R18 e-tron quattro LMP1 race car has started testing in the US.

The car is expected to compete for Audi in the World Endurance Championship in 2014, which includes the 24 Hours of Le Mans race. Audi says the car is "fundamentally new", and that it conforms to new technical regulations for the 2014 race season

"After building the first prototype, testing on various race tracks is now taking centre-stage. The tests are mainly focused on achieving high mileages, coordinating the highly complex hybrid drive systems and working out an efficiency-optimised total package that has never before been as complex as this one."